**Background:** Overabundant sika deer (Cervus nippon) populations in Japan cause serious ecological and economic damage, and selective culling of females is an effective population control strategy. Mineral deficiencies—particularly sodium (Na), calcium (Ca), and magnesium (Mg)—may act as attractants for culling, but no prior study had evaluated whether feed plants in Japan provide sufficient amounts of these minerals or compared deficiencies between sexes. **Methods:** The authors constructed a dataset of leaf Na, Ca, and Mg contents (g per kg dry matter) for 191 plant species known to be consumed by sika deer in Japan, using data from the TRY Plant Trait Database (3179 values from five original publications). Mineral provision was calculated by multiplying daily dry matter intake (DMI) by leaf mineral concentration. Mineral requirements were calculated using published equations for Cervus and goats, adapted for sika deer. Four DMI scenarios (0.5, 1.5, 3.0, 4.5 kg) and four body weight scenarios (30, 60, 90, 120 kg) were simulated, excluding unrealistic combinations. Na requirements included maintenance, antler growth (males), and lactation (females, using sika deer milk Na content of 1.00 g/L). Ca requirements included maintenance, antlers, and lactation (milk Ca: 1.62 g/L). Mg requirements were based on goat equations (milk Mg: 0.0819 g/L). Requirements for body growth were excluded to set conservative thresholds. **Key Results:** The average leaf contents were Na: 0.47 ± 0.82, Ca: 15.3 ± 8.4, and Mg: 3.5 ± 1.8 g/kg dry matter. Na requirements were rarely met: in most of the 12 scenarios, fewer than 50% of feed plant species provided sufficient Na. Na deficiency was more intense for lactating females than males, as the Na requirement for females was more than double that of males. Mg was sufficient in most scenarios, except combinations of large body weight and small DMI. Ca sufficiency depended heavily on the scenario: lower DMI resulted in insufficient Ca provision for a large portion of plant species, especially at higher body weights, while Ca requirements were met when DMI was ≥3 kg. Ca deficiency was more intense for males than females. **Clinical Implications:** The findings suggest that Na and Ca are likely limiting minerals for sika deer in Japan, particularly under overpopulation conditions where feed plant availability and diversity are reduced. Na is proposed as an effective attractant for selectively culling female deer, especially during lactation, while Ca may be more attractive to males. The authors recommend using multiple mineral attractants seasonally to improve culling efficiency. Limitations include the use of global rather than local plant trait data, lack of data on actual feed plant species composition in wild deer diets, and reliance on mineral requirement equations not specifically validated for sika deer.